Number literals
-----
<?php

0;
+0;
-0;
0.0;
-0.0;
42;
-42;
42.0;
-42.0;
42.5;
-42.5;
1e42;
-1e42;
1e1000;
-1e1000;
-----
0;
+0;
-0;
0.0;
-0.0;
42;
-42;
42.0;
-42.0;
42.5;
-42.5;
1.0E+42;
-1.0E+42;
INF;
-INF;